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To fix a leaking tap, first identify where the water escapes and which faucet model you have. A drip from the spout often needs a model-specific internal seal, seat or cartridge; water beneath the sink may have a different cause. Shut off and verify the water supply before opening the faucet, and call a plumber if you cannot isolate it safely.

This is a sourced guide for an accessible sink tap, called a faucet in the US. FixNest has not supplied a hands-on repair record for this article. Its AI-generated illustration is explanatory, not a photograph of a completed repair or a substitute for your manufacturer’s parts diagram.

Tools, materials and rough costs

Use your faucet’s service instructions to decide which items are actually needed. These are broad USD planning allowances, not retailer quotes or reported personal spending. Taxes, shipping and the particular model can change the cost considerably.

Item	Planning allowance	Notes
Correct screwdriver or hex key	$5–20	Match the handle screw exactly
Suitable wrench	$10–25	Only if the manual calls for one
Model-specific seal, washer or repair kit	$3–20	Not interchangeable between all taps
Model-specific replacement cartridge	$15–80 or more	Confirm the part number first
Manufacturer-specified removal tool	$10–35 if required	Some cartridges need a dedicated puller
Towels, small tray and drain cover	$0–10	Use suitable items already owned
Flashlight and protective eyewear	$10–30 if needed	Improve inspection and protect against debris

Do not buy a cartridge merely because it resembles the old one. Check warranty support before ordering: you may need the model, purchase information and a description of the fault. A plumber’s labor is not included in these figures; request a local quote when professional work is needed.

Before you start: locate the leak

Dry the faucet, sink rim and accessible cabinet surfaces. Observe where fresh water first appears without removing parts. Keep electrical items away from wet areas. If there is a disposal, outlet or other electrical equipment near water, do not reach into that area; arrange safe isolation and professional help.

Use the location to choose your next action:

• Spout drips after the tap is fully off: investigate the internal valve components using the exact model’s troubleshooting guide.
• Water appears around the handle: a cartridge or associated seal may be involved, but identify the model before dismantling it.
• Water appears around a swiveling spout: consult the maker’s spout-seal instructions rather than assuming a valve cartridge will solve it.
• Water appears beneath the sink: supply connections, hoses, the faucet body or the drain may be involved. Do not treat every cabinet leak as a dripping-tap repair.

For example, Moen’s troubleshooting guidance describes cartridge-related leaks and emphasizes that replacement methods vary by model. Delta’s parts finder distinguishes several cartridge and repair-kit designs. These examples show why a universal washer replacement is unreliable.

Step-by-step: plan and carry out the correct repair

1. Confirm permission and the faucet identity

Renters should notify the landlord and obtain permission before changing fixture parts. Look for the brand and model on paperwork, a label, or the manufacturer’s identification tool. Take your own clear photographs of the whole tap and accessible labels. Do not loosen plumbing just to search for a number.

If you cannot identify it, contact the manufacturer with those photographs. A recognizable handle shape alone is not enough to order a compatible cartridge.

2. Read the exact service instructions

Find the manufacturer’s guide and parts drawing for that model. Confirm the required part, removal method, orientation and any special tool. Save the instructions where you can read them during the repair. If the guide requires access inside a wall, specialist plumbing, or unfamiliar disassembly, stop and use a plumber.

Do not transfer tightening values, clip positions or lubrication advice from another faucet. Some procedures that look similar use different retainers and seals.

3. Check the accessible shutoff valves

Locate the hot and cold supply valves serving the sink. Check visually for corrosion, dampness or damaged connections. Do not force a stiff valve, use pliers to overpower it, or disturb an old supply tube. If a valve is leaking, seized or inaccessible, this is a separate plumbing problem requiring attention before the faucet can be opened.

Know how to contact maintenance or a plumber if the water cannot be stopped. Do not experiment with a shared building supply.

4. Isolate and verify the water supply

Close the appropriate hot and cold supplies gently according to their design. Open the faucet to release remaining pressure and confirm that sustained flow stops. Water that continues running means isolation has failed; do not proceed with disassembly.

Allow hot components and water to cool before handling them. Delta’s repair guidance also begins with shutting off the supplies and draining the remaining water. Shutoff verification matters more than rushing to the visible screw.

5. Protect the drain and organize small parts

Cover the drain opening and place a towel and small tray nearby. Keep removed screws and clips in sequence. Photograph each stage with your own camera before changing the arrangement. Those images are for reassembly and documentation; a generic diagram cannot show the orientation of your particular parts.

Keep the workspace dry enough to avoid slipping. Use lighting that does not introduce electrical equipment into a wet cabinet.

6. Follow the model-specific removal procedure

Remove only the components described in the service guide, using the specified tools. Stop if a cover, retaining nut or cartridge will not release as instructed. Twisting harder can damage the faucet body or move connected pipework.

Do not pry against a decorative finish or substitute a longer lever for a proper removal tool. Keep any reusable retainer identified; do not assume the new package contains every required piece.

7. Install the confirmed replacement part

Compare the part number and orientation with the manufacturer’s instructions before installation. Reassemble in the stated order. Use only the lubricant, sealant or other consumable explicitly specified for that part. Thread tape is not a general cure for a worn internal seal, and extra tightening can damage components.

If the new part does not fit normally, stop. Do not trim a seal, remove an unexplained spacer or force a mismatched cartridge into place.

8. Restore water slowly and inspect

Recheck that the assembly is complete. Restore the supply gradually while watching the faucet and accessible connections. Operate the handle normally, then turn it off and check the original leak location. Wipe surfaces dry so fresh moisture is easier to see.

Stop and isolate the water again if a new leak appears. Do not leave the sink running unattended while investigating the cabinet.

9. Check again after normal use

Look for renewed drips and dampness after the tap has been used and turned off. A continuing leak means the diagnosis, part, installation or faucet body needs further assessment. Record what changed and contact the manufacturer or a plumber rather than repeatedly tightening the assembly.

Common mistakes

Assuming every tap uses a rubber washer. Cartridge, ceramic-disc and other valve arrangements differ. Identify the design before opening it.

Repairing the wrong location. A leak from the drain or supply hose is not solved by replacing a spout cartridge.

Forcing shutoffs or corroded parts. The repair stops being a small fixture job when a valve or connection cannot be moved safely.

Using unapproved grease or sealant. Materials must be compatible with the specific seals and potable-water application. Follow the manufacturer’s instructions instead of treating any household lubricant as equivalent.

When to call a professional

Call a plumber if you cannot fully stop the water, the leak is concealed, the cabinet or ceiling is damaged, connections are corroded, the faucet body is cracked, or the problem remains after a correctly specified repair. Leave wall opening, supply-line alterations and any work requiring specialist skills to qualified help. For renters, report the problem to the landlord or maintenance team promptly.

Related reading

• Basic tools every beginner should own
• Start Here: assess the job before you begin
• Browse Basic Repairs

Additional related article links will be added when those guides are public. Report unclear instructions through the Contact page.

Start with a small set of measuring tools, well-fitting screwdrivers, a hammer, pliers and basic protective equipment. Add specialist tools when a particular project needs them; a large kit is poor value if its useful pieces are missing or uncomfortable to use. Tools help with a defined task, but they do not make electrical, gas or structural work suitable for a beginner.

This is a sourced buying and planning guide, not a report of tools personally tested by FixNest. The illustration is AI-generated and shows a general arrangement, not a photographed toolkit or a product endorsement.

Tools, materials and rough costs

The amounts below are broad US-dollar planning allowances, not checked offers, personal purchase prices or promises about a particular retailer. Quality, size, local availability and taxes change the total. Compare current prices before buying, and subtract items you already own.

Item	Planning allowance	What it adds
Tape measure	$8–20	Measures furniture, clearances and materials
Multi-bit screwdriver	$10–25	Handles common screws when the correct bit is included
Claw hammer	$12–30	Drives and removes suitable nails
Adjustable wrench	$10–25	Turns accessible nuts with flat sides
General-purpose pliers	$10–25	Grips suitable small parts
Retractable utility knife	$6–15	Cuts packaging and appropriate sheet materials
Small spirit level	$8–20	Checks level and plumb
Safety glasses	$5–15	Protects eyes from relevant impact hazards
Small clamps	$10–25 per pair	Holds suitable work on a stable bench
Pencil, storage box and task light	$15–45 combined	Marking, organization and visibility

Buying everything new from this list gives a rough allowance of $94–245 before tax. That is a planning sum, not a recommended minimum spend. A screwdriver, tape measure and safety glasses may be enough for your first furniture adjustment. Materials such as screws, fillers and lubricants belong in the budget for the actual job.

Before you choose a kit

Renters should check their lease and ask before altering fixtures, drilling walls or repainting. Keep the landlord’s repair responsibilities separate from jobs you are allowed to do. A basic toolkit is useful even when you only measure a space, assemble freestanding furniture or document a problem for maintenance.

Read the tool’s instructions and inspect it before use. The Canadian Centre for Occupational Health and Safety recommends choosing tools for their intended jobs and taking damaged tools out of use. A loose hammer head, split handle or worn driver tip is a reason to replace the tool, not a challenge to work around. See its general hand-tool guidance.

Build your beginner toolkit step by step

1. Write down your next three small jobs

Choose specific tasks rather than broad ambitions: tightening a cabinet hinge, measuring storage space or adjusting a loose furniture handle. Write the fastener type and material beside each job. This turns a shopping list into a project list and exposes specialist requirements before you spend money.

If a task involves wiring, gas pipework, structural movement or a concealed leak, put professional assessment on the list instead of a new power tool. Do not buy a kit on the assumption that every home problem is a small repair.

2. Choose a tape measure you can read easily

Look for clear markings and a lock you can operate comfortably. For US projects, inch markings are useful; dual inch-and-metric markings help when furniture instructions use millimeters. Check the length against the spaces you expect to measure rather than automatically choosing the longest tape.

Measure clearances as well as the item itself. A storage unit may fit a wall but block a door, drawer or service panel. Write measurements down and label which is width, depth and height. Keep fingers away from the returning blade and retract it under control.

3. Match screwdrivers to actual screw heads

A multi-bit driver saves storage space only if its bits match your screws. Check for Phillips, slotted, hex or Torx heads in the furniture or fixtures you intend to work on. Metric and imperial hex fittings are not interchangeable just because two bits look similar.

The bit should seat firmly without rocking. CCOHS explains that the driver must match both the screw-head type and size, and that a screwdriver should not substitute for a pry bar. Support loose work on a bench instead of holding it in your palm. See its screwdriver safety guidance.

4. Pick a manageable hammer and gripping tools

A general-purpose claw hammer suits many light household jobs, but comfort and control matter more than buying the heaviest option. Hold it in the shop if possible. Check that its head and handle are secure and that the grip does not force an awkward wrist position. Wear suitable eye protection for striking work; CCOHS’s hammer guidance explains the risks of damaged striking faces and unsuitable use.

Choose an adjustable wrench with jaws that move smoothly and close squarely. It is for suitable flat-sided nuts, not for crushing decorative fittings. Pliers have different purposes; they should not replace a correctly fitting wrench on a nut you need to preserve. Stop if force starts bending the part or moving surrounding pipework. See wrench safety guidance.

5. Add marking, holding and inspection tools

A pencil and small level often prevent more rework than another cutting tool. Use them to check an intended position before fastening anything. A level does not locate hidden cables or pipes, and a pencil mark does not confirm that a wall can support a load.

Clamps help keep appropriate work stable on a suitable bench. Choose clamps with enough opening for the material and use protective pads where needed. Add a task light so you can inspect the work without balancing a phone in one hand. Clear the floor and keep children and pets away from the work area.

6. Store the kit so you can inspect it

Separate sharp edges from measuring tools and loose fasteners. Retract a knife blade before storage, keep small parts in labeled compartments and dry damp tools before putting them away. Store the box securely where children cannot access it. A simple inventory inside the lid makes missing pieces obvious before the next job.

Common mistakes

Buying by piece count. A kit may count every small bit as a separate item. Compare the actual tools, useful bit sizes and replacement availability instead.

Starting with power tools. A drill also needs the right bit, fixing, material knowledge and safe work setup. Borrowing or renting may make more sense for an occasional approved task. Read the manufacturer’s instructions and get competent guidance before using unfamiliar power tools.

Skipping protective equipment. Ordinary prescription glasses are not a substitute for suitable safety eyewear. Select protection for the actual hazard; gloves that help with rough materials may be unsuitable around rotating machinery.

Using furniture as a workbench or standing platform. A chair is not a ladder. Arrange a stable work surface and suitable access equipment before starting; stop when you cannot work with secure footing.

When to call a professional

Call a qualified professional for mains electrical work, gas work, structural repairs, suspected hazardous materials or plumbing beyond a straightforward accessible fixture repair. Also stop when a fastener is severely corroded, a fitting moves with attached pipework, or the cause of a recurring problem is unclear. Owning the right-looking tool is not proof that the repair is within your skills.

Related reading

• How to fix a leaking tap
• Start Here: plan a small home project
• Browse Basic Repairs

More article links will be added as the related guides become publicly available. For how FixNest uses sources and handles corrections, read the Editorial and Testing Policy.